[SPOILERS for books] Question about "The First Heretic" book

As a precaution please refrain from posting any major spoilers for any events. Thank you.

Hello everyone, I'd like to ask something regarding the events in the book. I am currently on chapter 24 in the book and I would like to know if the book covers events on Istvaan V at all. I've only read "Horus Rising", "False Gods" and "Galaxy in Flames" so I don't really want to spoil the BIG EVENT that is coming up on Istvaan V.

As a precaution please refrain from posting any major spoilers for any events. Thank you.

Hello everyone, I'd like to ask something regarding the events in the book. I am currently on chapter 24 in the book and I would like to know if the book covers events on Istvaan V at all. I've only read "Horus Rising", "False Gods" and "Galaxy in Flames" so I don't really want to spoil the BIG EVENT that is coming up on Istvaan V.

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Yes it does.
It's about the Word Bearers journey to the Dropsite Massacre and the beginning of the Heresy.

If you got past Lorgar being a whiney b!**h at the beginning, the rest is a good read.

It's also the beginning of a story arc for Word Bearers which goes onto Know No Fear, then Betrayer.